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7057422
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2011-08-14T14:38:38.550
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text
Body
You're taking a JSON string and pretending that it's a Javascript object literal. But, remember, JSON is merely named after Javascript's object notation! You're then hoping that <code>eval</code> will directly evaluate this and return an object, but this is not the case. <hr> <h3>Observations</h3> Writing the following in the Firebug console: <pre><code>eval('{"caption":"A caption","filename":"myimage_thumb.jpg"}') </code></pre> will also yield a SyntaxError. (Ideally, you'd have narrowed your problem down to this!) Interestingly, constructing an object more explicitly does work (for this input): <pre><code>eval('new Object({"caption":"A caption","filename":"myimage_thumb.jpg"})') </code></pre> As does just forcing the input into being a certain kind of expression, with parentheses: <pre><code>eval('({"caption":"A caption","filename":"myimage_thumb.jpg"})') </code></pre> <hr> <h3>Explanation</h3> It all comes down to this statement from 12.4 in the ECMAScript standard: <blockquote> Note that an <code>ExpressionStatement</code> cannot start with an opening curly brace because that might make it ambiguous with a Block. </blockquote> <a href="http://rayfd.wordpress.com/2007/03/28/why-wont-eval-eval-my-json-or-json-object-object-literal/" rel="noreferrer">This article</a> explains the issue in depth, but in summary the solution is to use <code>JSON.parse(res)</code> to obtain an object from a JSON string. This is the proper approach, and it will not fail as long as your input is valid JSON.
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1. POProblem with Javascript, AJAX & JSON
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1. USLightness Races in Orbit
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